Jackets and hide look beautiful HH, my jackets all have narrow sleeves, on my last one in veg tan, i barely can bend my elbow not even 45 degree the first few weeks i have it, and since the leather is stiff the creases on the inside of the elbow fold deeply and cutting my blood flow, now i can move relatively freely in it, the elbow doesnt expand but the surrounding area just getting soft and the creases are more naturally formed so it gives way without folding deeply into my arm anymore.